I just installed my PAL in my '08 GXP this weekend. Piece of cake -- just be careful removing that inst cluster trim. Installed easy and worked like a champ. Just took a few mins to get comfortable with the soft keys, etc.

Popped by the dealership and had them enable the PAL via a Tech II so my XM would work. XM & iPod are working great. Having seen some of the posts I was concerned but it worked out fine. Only used it for a couple of hrs so far so I'm interested to see if I run into any of the intermittent XM operation issues. I did note that the iPod mode is on XM1 as opposed to XM0.

Regards